MCBs

MCBs, or miniature circuit breakers, are a type of switch used to automatically turn off electrical circuits during abnormal conditions. MCBs often replace fuses in low voltage electrical circuits as they can be more reliable, much more sensitive and are resettable.


How an MCB Works


When continuous overcurrent flows through an MCB, a bimetallic strip is heated and causes it to bend. This bending of the bimetallic strip releases a mechanical latch opening the contacts and turning off the MCB, thereby stopping the current to flow in the circuit. To restart the flow of current the MCB must be manually turned on. This mechanism protects the MCB from faults arising due to overcurrent or overload and is intended to prevent the accidental overloading of the cable in a no-fault situation. The speed of the MCB tripping will vary with the degree of the overload. This is usually achieved by the use of a thermal device in the MCB. The second characteristic is the magnetic fault protection, which is intended to operate when the fault reaches a predetermined level and to trip the MCB within one-tenth of a second. The level of this magnetic trip gives the MCB its type characteristic.


MCBs are used to perform many functions such as local control switches, isolating switches against faults and overload protection devices for installation or specific equipment or appliances.


MCB Types


MCBs have three common types for circuit protection in residential, commercial and industrial applications. The use is classified by a type, which determines the tripping characteristics of the MCB:


Type B - trips between 3 and 5 times the load current


This type will trip instantly at a rate of three to five times its rated current. These are normally used for resistive or small inductive loads where switching surges are very small. Therefore, these are suitable for residential or light commercial installations.


Type C - trips between 5 and 10 times the full load current


This type will trip instantly at a rate of five to ten times its rated current. These are normally used for high inductive loads where switching surges are high such as small motors and fluorescent lighting. In such cases, type C MCBs are preferred to handle higher value of short circuit currents. Therefore, these are suitable for highly inductive commercial and industrial installations.


Type D - trips between 10 and 20 times the full load current


This type will trip instantly at a rate of ten to twenty-five times its rated current. These are normally used for very high inductive loads where high inrush current is very frequent. These are suitable for specific industrial and commercial applications. The common examples of such applications include x-ray machines, UPS systems, industrial welding equipment, large winding motors, etc.


How to select a suitable MCB for the application?


Focus on 3 main points to choose the right MCB for the electrical circuit


  1. Ampere rating

  2. Short circuit breaking capacity

  3. Application type

...
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รายละเอียดสินค้า / Description ราคา / Price Number of Poles Current Rating Model Number Range Series Rated AC Voltage Tripping Characteristics Breaking Capacity Mounting Style Rated DC Voltage Length Width Depth Application
RS Stock No. 776-8968
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F74106
THB232.96
Each
Units
1 6 A - Acti 9 iC60N 230 V, 400 V Type C 6 kA - 72V - 18mm - -
RS Stock No. 707-6032
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CCP842001R1169
Brand :ABB
THB6,450.70
Each
Units
2 16 A - High Performance S800 - - 5 kA - 800V 95mm 53mm 88.5mm -
RS Stock No. 131-999
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS272001R0034
Brand :ABB
THB2,091.79
Each
Units
2 3 A - System M Pro S200 440 V Type C 10 kA - 125V 88mm 35mm 75.8mm -
RS Stock No. 776-3373
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F73202
THB3,993.03
Each
Units
2 2 A - Acti 9 iC60N 440 V Type B 6 kA - 125V 36mm - 85mm -
RS Stock No. 521-4939
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY6102-7
Brand :Siemens
THB986.33
Each
Units
1 2 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 132-015
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS272001R0064
Brand :ABB
THB1,673.09
Each
Units
2 6 A - System M Pro S200 440 V Type C 10 kA - 125V 88mm 35mm 75.8mm -
RS Stock No. 734-9141
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F77310
THB3,546.81
Each
Units
3 10 A - Acti 9 iC60N 12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V, 440 V Type C 6 kA - 12 → 144V - - - -
RS Stock No. 776-8845
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F84440
THB4,193.28
Each
Units
4 40 A - Acti 9 iC60H 440 V Type C 10 kA - 250V - 72mm - -
RS Stock No. 776-3436
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F74102
THB1,742.45
Each
Units
1 2 A - Acti 9 iC60N 240 V Type C 10 kA - 72V 18mm 78.5mm 85mm -
RS Stock No. 772-1296
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY4206-7
Brand :Siemens
THB2,092.67
Each
Units
2 6 A - Sentron 5SY4 400 V Type C 10 kA - - 90mm 36mm 76mm -
RS Stock No. 772-1515
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9N61526
THB4,652.96
Each
Units
2 6 A - Acti 9 C60H-DC - Type C - - 500V - 36mm 73mm -
RS Stock No. 131-905
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS272001R0404
Brand :ABB
THB1,994.96
Each
Units
2 40 A - System M Pro S200 440 V Type C 10 kA - 125V 88mm 35mm 75.8mm -
RS Stock No. 776-3449
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F74104
THB1,743.37
Each
Units
1 4 A - Acti 9 iC60N 240 V Type C 10 kA - 72V 18mm - 85mm -
RS Stock No. 622-0014
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY4102-7
Brand :Siemens
THB589.03
Each
Units
1 2 A - Sentron 5SY4 230 V, 400 V Type C 10 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 791-3467
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9F55104
THB934.22
Each
Units
1 4 A - Acti 9 iC60H 12 → 60 V, 100 → 133 V, 220 → 240 V Type D 10 kA DIN Rail 12 → 48 V, 72 V 85mm 18mm 78.5mm -
RS Stock No. 776-8860
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.A9K24320
THB1,149.50
Each
Units
3 20 A - Acti 9 iK60N 400 V Type C 6000 A - - - 54mm - -
RS Stock No. 521-4917
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.5SY6101-7
Brand :Siemens
THB622.91
Each
Units
1 1 A - Sentron 5SY6 230 V, 400 V Type C 6 kA - - 89.8mm 17.6mm 76.4mm -
RS Stock No. 131-983
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.2CDS272001R0044
Brand :ABB
THB2,054.18
Each
Units
2 4 A - System M Pro S200 440 V Type C 10 kA - 125V 88mm 35mm 75.8mm -
RS Stock No. 746-7558
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.S202-B6
Brand :ABB
THB1,303.92
Each
Units
2 6 A - System M Pro S200 400 V Type B 6 kA - - 88mm 35mm 69mm -
RS Stock No. 847-3497
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.FAZ-D13/2-NA
Brand :Eaton
THB2,780.87
Each
Units
2 13 A - XEffect FAZ 240 → 415 V Type D 10 kA - - 35.4mm 105mm 75.5mm -
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